Diamonds aggregation

There is also a slight difference between the refinement symbol and the diamond aggregation symbol. The diamond makes the abstract and constituent types (or actions) part of the same model. In these models, it is explicit that a w heeis a part of some particular car and that there is some way of knowing which buy action a particular pay is part of some por-... 

Baker M. B. and Stolper E. M. (1994) Determining the composition of high-pressure mantle melts using diamond aggregates. Geochim. Cosmochim. Acta 58, 2811-2827. 

Carbonado is a porous, randomly polycrystalline diamond aggregate [140]. Balias on the other hand is defined as polycrystalline diamond of oriented globular growth . Its crystallites have (110) directions oriented radially. 

In addition, electron diffraction patterns of polycrystalline diamond are similar to those of basal-plane oriented polycrystalline graphite and, when analyzing mixtures of the two, it may be difficuitto separate one pattern from the other. Unfortunately, mixed graphite-carbon-diamond aggregates eire common in natural and synthetic materials. 

The approximate intensity rules are given by the assumption of spherically symmetrical aggregates of atoms about the positions of the carbon atoms in diamond. They are that the reflections with h, k and l all even and their sum divisible by 4 should be the strongest, those with h, k and l all odd should be next, and those with h, k and l all even with sum not divisible by 4 the weakest. Table 1 verifies this prediction the seven strongest reflections are of the first type, and none of the third... 

Crystals of high purity metals are very soft, while high purity diamond crystals are very hard. Why are they different What features of the atomic (molecular) structures of materials determine how hard any particular crystal, or aggregate of crystals, is Not only are crystals of the chemical elements to be considered, but also compounds and alloys. Glasses can also be quite hard. Is it for similar reasons What about polymeric materials ... 

Determination of compositions of melts segregated from peridotite using aggregates of diamond. Earth Planet. Sci. Letters, 114, 477-89. 

Pollitt SK, Pallos J, Shao J, Desai UA, Ma AA, Thompson LM, Marsh JL, Diamond MI (2003) A rapid cellular FRET assay of polyglutamine aggregation identifies a novel inhibitor. Neuron 40(4) 685-694 Ranganathan S, Bowser, R (2003) Alterations in G(l) to S phase cell-cycle regulators during amyotrophic lateral sclerosis. Am J Pathol 162(3) 823—835... 

Fig. 11 NMR shifts of 31 (filled square), 32 (filled diamond), and 33 filled circle) showing the presence of aggregation in increasing solvent polarity for 32...

Diamond, S. and Ong, S. (1992). Proceedings 9th International Conference on Alkali-Aggregate Reactions in Concrete, London, 269-78. 

A unique situation exists in the case of diamonds, where the detailed spectroscopic descriptions of the centers are detected, but models are only proposed for a few of these. From more then 100 detected centers models are only determined for seven, mainly based on EPR interpretations. The model includes identification of the impurity, vacancy, interstitial atom, their aggregations and their crystallochemical position together with quantum-chemical and spectroscopic description. 

The luminescence of diamonds is related to various defects in its structure. Almost always, luminescence centers in diamonds are related to N atoms. It is logical, because the atomic radii of C and N are nearly equal (approximately 0.77 A). Luminescence spectroscopy has proven to be the most widely used method in studies of diamonds even in comparison with optical absorption, ESR, IR and Raman spectroscopies. Himdreds of spectra have been obtained, fluorescence characteristics enter into diamond quality gemological certificates, a wide range of electronic and laser applications are based on diamond optical properties in excited states nitrogen center aggregation is controlled by the residence time of diamond in the mantle, distinction between natural... 

Tishmack, J. K., Olek, J. Diamond, S. 1999. Characterization of high-calcium fly ashes and their potential influence on ettringite formation in cementitious systems. Cement, Concrete, and Aggregates, 21, 82-92. 

There are two types of internal textures seen in natural diamond crystals that show conditional changes. Although Dana [9], [10] and Orlov [11] distinguished between single crystals and polycrystalline aggregates, they did not put crystals that had experienced the two conditions into different categories. 

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